For all of the web maps we created for the three databases we have added the Utility Network to the Web Map and have tracing enabled and the pre-configured traces work. Especially for Communications, we want the traces to show the associations in the trace results in ArcGIS Field Maps and the Web Map in the Experience Builder we have configured (i.e. <Network Level> Cable and Communications Edge Object Strands). We have associations checked turned on in Map Viewer but the only associations that appear are containments, no connectivity or attachment associations.
We are currently operating on Enterprise 11.4 and Utility Network Version 7 for our Electric, Water and Communications utilities' databases.